Sheffield Wednesday manager Alan Irvine was left unhappy with his side's lapse in concentration at the start of the second half of their 1-1 draw with Colchester.
Wednesday conceded five minutes after the break when Andy Bond volleyed home and they only rescued a point when Neil Mellor grabbed a late leveller.
Irvine said: "I didn't think there was a lot in it, in the first half.
"But we started the second half slowly and we got punished for it. That's something that we need to address because I wasn't happy with the way that we started the second half.
"We will look at that and see how we can learn from that. We changed the system after that and that probably changed the game.
"I thought from that point, we had Colchester on the back foot with the odd exception."